human epidermal growth factor receptor 2-negative metastatic breast cancerribociclibPalbociclibletrozoleRibociclib-inducedendocrine therapyCDK4/6I
…gside endocrine therapy for hormone receptor-positive (HR+) and human epidermal growth factor receptor 2-negative metastatic breast cancer. Ribociclib-induced colitis is a rare drug reaction with unknow…